EP0045709B1 - Process for the preparation of meta-chlorinated anilines - Google Patents

Process for the preparation of meta-chlorinated anilines Download PDF

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Publication number
EP0045709B1
EP0045709B1 EP81420115A EP81420115A EP0045709B1 EP 0045709 B1 EP0045709 B1 EP 0045709B1 EP 81420115 A EP81420115 A EP 81420115A EP 81420115 A EP81420115 A EP 81420115A EP 0045709 B1 EP0045709 B1 EP 0045709B1
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Prior art keywords
process according
aniline
dichloro
reaction
trichloro
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EP81420115A
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German (de)
French (fr)
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EP0045709A1 (en
Inventor
Georges Cordier
Pierre Fouilloux
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Bayer CropScience SA
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Rhone Poulenc Agrochimie SA
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Priority claimed from FR8017324A external-priority patent/FR2487823A1/en
Priority claimed from FR8020979A external-priority patent/FR2491059A2/en
Application filed by Rhone Poulenc Agrochimie SA filed Critical Rhone Poulenc Agrochimie SA
Priority to AT81420115T priority Critical patent/ATE9686T1/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C211/00—Compounds containing amino groups bound to a carbon skeleton
    • C07C211/43—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
    • C07C211/44—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring
    • C07C211/45—Monoamines
    • C07C211/46—Aniline
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
    • C07C209/68—Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton
    • C07C209/74—Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton by halogenation, hydrohalogenation, dehalogenation, or dehydrohalogenation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
    • C07C209/30—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds
    • C07C209/32—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups
    • C07C209/36—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings in presence of hydrogen-containing gases and a catalyst

Definitions

  • the present invention relates to a process for the preparation of anilines substituted by chlorine in the meta position by the action of hydrogen on more highly halogenated nitrogenous aromatic compounds.
  • These metachlorinated anilines are intermediaries in particular for the manufacture of phytosanitary products.
  • the present invention specifically aims to prepare chloranilines substituted in meta by selective hydrodechlorination of polychloranilines or polychlorobenzenes, without corrosion problem.
  • Lewis acid compounds having a central atom deficient in electrons capturing the electrons of atoms such as halogens.
  • the preferred compounds are chlorides, bromides, iodides or even fluorides of elements such as boron, aluminum, gallium, tin, phosphorus, arsenic, antimony, bismuth, titanium, zirconium, molybdenum, manganese, iron, cobalt, nickel, copper, zinc and cadmium.
  • catalytic amount is meant, within the meaning of the invention, an amount such that the molar ratio of Lewis acid to the starting nitrogenous and chlorinated benzene derivative is between 0.0001 and 1 and preferably between 0.01 and 0.5.
  • the process according to the invention is carried out in the liquid phase (apart of course from the noble metal catalyst).
  • the latter are not hydrochlorinated under the conditions of the reaction.
  • the liquid phase can also be heterogeneous and consists of a two-phase liquid medium.
  • the pressure at which the reaction takes place can be selected from a wide range. Although this is not advantageous, it can be carried out under reduced pressure, for example in a solvent medium at reflux. However, preferably, one works at a pressure at least equal to atmospheric pressure. Working at atmospheric pressure makes it possible to supply hydrogen in the form of a current at an adjustable flow rate.
  • the pressure When working under pressure, the pressure is generally greater than 3 bars (relative pressure) and preferably greater than 5 bars. There is no critical upper limit for pressure, but for economic reasons, it is advantageous to operate at pressures below 100 bar, with pressures below 20 bar being preferred.
  • the reaction temperature is generally between 90 and 300 ° C, preferably between 110 and 200 ° C.
  • a high temperature can, in the case where relatively volatile Lewis acids are used, imply the existence of a relatively high partial pressure for the compounds of the vapor phase other than hydrogen (by vapor phase we obviously mean the phase vapor overcoming the reaction liquid medium).
  • the noble metals constituting the base of the catalysts used in the invention are metals from group VIII of the periodic classification such as ruthenium, rhodium, palladium, osmium, iridium and platinum; palladium is the preferred metal.
  • the metal can be in the metallic state or in the state of a chemical compound; generally it is preferred that the metal is used in the metallic state.
  • the catalyst can be supported or unsupported.
  • any support known per se can be used to support catalysts, provided that this support is resistant to the medium and to acids; as a support which is more particularly suitable, mention may be made of activated carbon, alumina, silica, barium sulphate; activated carbon is a preferred support.
  • the catalyst and its support are advantageously in finely divided form; specific surfaces greater than 100 m 2 / g are generally suitable.
  • the amount of catalyst used is such that the proportion by weight of noble metal of the catalyst relative to the compound of formula (I) to be treated is generally between 0.01 and 10%, preferably between 0.1 and 5%.
  • the noble metal can be associated with another metal co-deposited with it on the support.
  • This second metal belongs to groups 1b to 5a of the periodic table. Mention may in particular be made of bismuth, lead, tin, thallium, mercury and silver. The Applicant has notably noted that good results are obtained by using silver.
  • anilines substituted in meta position by the chlorine atom and capable of being prepared by the process according to the invention there may be mentioned preferably: metachloraniline; 3,5-dichloro aniline but also 5-chloro-2-methyl aniline; 5-chloro-3-methyl aniline; chloro-3 meth ⁇ l-4 aniline; 3,5-dichloro-4-methyl aniline; 5-chloro-3,4-dimethyl aniline; 3-chloro-4-ethyl aniline; 3-chloro-2-benzyl aniline; 4,4-diamino-2,6,2 'tetrachtoro, 6' diphenyl; 3-chloro-2-methoxy aniline; 5-chloro-2-methoxy aniline; 3,5-dichloro-2-methoxy aniline; 3-chloro-4-methoxy aniline; 5-chloro-3-methoxy aniline; 3,5-dichloro-4-methoxy aniline; 3-chloro-2-phenoxy aniline; 5-chloro-2-phenoxy aniline
  • the process according to the invention can be carried out continuously or batchwise.
  • the catalyst can be separated, if necessary, by filtration or by equivalent means such as spinning; the metachlorinated aniline prepared can be separated by any means known per se, for example by extraction using a solvent and / or by distillation.
  • the process according to the invention is very advantageous since it makes it possible to obtain metachlorinated anilines under excellent conditions of selectivity, at temperatures and under moderate pressures, without worrying about significant corrosion and premature wear of the material.
  • the following examples given without limitation, illustrate the implementation of the method according to the invention and the results obtained.
  • the autoclave is closed, purged first with argon, then with hydrogen. Then hydrogen is introduced at a pressure of 10 bars, the autoclave is isolated and heated to 160 ° C. while allowing the autogenous pressure to increase to a total (relative) pressure of 21 bars. It is left to react under these conditions for 4 h 30 min.
  • the latter is dissolved in the molten aniline at the reaction temperature (160 ° C).
  • the reaction lasts 3H20mn.
  • Example 2 The procedure is as in Example 2, replacing the stannous chloride with 0.32 g of zinc iodide. The reaction lasts 10 hours.
  • the reaction is carried out at 160 ° C under 21 bars.
  • the treatment of the reaction medium after reaction is carried out as in Example 1.
  • Example 2 The procedure is as in Example 1, replacing 2,3,4,5-tetrachloraniline with 3,4,5-trichloraninine (0.985 g), Lewis acid being added in the form of 1 cm 3 d '' a 10% w / v cyclohexane solution and using 0.05 g of the same palladium catalyst.
  • the reaction is carried out for 120 min.
  • Example 2 hydrogen is introduced as in Example 1, except that the total pressure is 20 bars and the heating is carried out at 180 ° C for two hours.
  • a temperature of 160 ° C. is maintained and at atmospheric pressure a stream of hydrogen of 6 liters / h is sent for 30 minutes.
  • reaction mass is then treated with water and then with ether.
  • the catalyst is separated then the water.
  • the solvents are removed by distillation.
  • reaction medium being stirred, a temperature of 160 ° C. and a hydrogen stream of 27 l / h are maintained for 4 hours.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Description

La présente invention se rapporte à un procédé de préparation d'anilines substituées par le chlore en position méta par action de l'hydrogène sur des composés aromatiques azotés plus fortement halogénés. Ces anilines métachlorées sont des intermédiaires notamment pour la fabrication de produits phytosanitaires.The present invention relates to a process for the preparation of anilines substituted by chlorine in the meta position by the action of hydrogen on more highly halogenated nitrogenous aromatic compounds. These metachlorinated anilines are intermediaries in particular for the manufacture of phytosanitary products.

La préparation de chloranilines substituées en position méta par réaction de polychloranilines en milieu acide notamment aqueux avec de l'hydrogène sous pression, en présence d'un catalyseur à base de métal noble, a été décrite dans le brevet français 2 298 531. Le procédé décrit nécessite toutefois l'utilisation de pressions élévées et de quantités très importantes d'acide chlorhydrique, ce qui pose de graves problèmes de corrosion. Les demandes de brevet européen 0 015 219 et 0 015 220 décrivent des procédés de préparation d'anilines chlorées en méta par hydrodéchloration catalytique en milieu aqueux acide, en présence de métal noble, de polychloranilines ou polychlorobenzènes plus fortement chlorés, à des pressions toujours supérieures à 3 atmosphères et de préférence à 5 atmosphères.The preparation of chloranilines substituted in the meta position by reaction of polychloranilines in acidic, especially aqueous, medium with hydrogen under pressure, in the presence of a catalyst based on a noble metal, has been described in French patent 2,298,531. The process described, however, requires the use of high pressures and very large amounts of hydrochloric acid, which poses serious corrosion problems. European patent applications 0 015 219 and 0 015 220 describe processes for the preparation of chlorinated anilines in meta by catalytic hydrodechlorination in acidic aqueous medium, in the presence of more highly chlorinated polychloranilines or polychlorobenzenes, at pressures always higher at 3 atmospheres and preferably at 5 atmospheres.

La présente invention a précisément pour but de préparer des chloranilines substituées en méta par hydrodéchloration sélective de polychloranilines ou polychlorobenzènes, sans problème de corrosion.The present invention specifically aims to prepare chloranilines substituted in meta by selective hydrodechlorination of polychloranilines or polychlorobenzenes, without corrosion problem.

L'invention concerne plus particulièrement un procédé de préparation d'anilines substituées en position méta par du chlore, par hydrogénation catalytique en phase liquide, à chaud à la pression atmosphérique ou sous pression, en présence de métaux nobles du groupe VIII de la classification périodique, de dérivés benzéniques azotés et chlorés, de formule:

Figure imgb0001
dans laquelle:

  • - Y représente l'atome d'hydrogène ou l'atome d'oxygène,
  • - X' et X", identiques ou différents entre eux, représentent chacun un atome de chlore ou un radical alkyle ou aryle ou aralkyle ou alkoxyle ou aralkoxyle éventuellement substitué, au moins l'un des X' et X" étant obligatoirement un atome de chlore, l'un des X' et X" pouvant, de plus, être l'hydrogène,
  • - F', R" et R"', identiques ou différents entre eux, représentent chacun un atome de chlore ou un radical alkyle ou aryle ou aralkyle ou alkoxyle ou aryloxyle éventuellement substitué, l'un au moins de ces trois symboles représentant l'atome de chlore, au plus deux des R', R" ou R"' pouvant, de plus, être l'hydrogène,

caractérisé en ce que la réaction est effectuée en milieu essentiellement anhydre, en présence d'une quantité catalytique d'au moins un acide de Lewis comme catalyseur.The invention relates more particularly to a process for the preparation of anilines substituted in the meta position with chlorine, by catalytic hydrogenation in the liquid phase, hot at atmospheric pressure or under pressure, in the presence of noble metals from group VIII of the periodic table , nitrogen and chlorinated benzene derivatives, of formula:
Figure imgb0001
 in which:
  • - Y represents the hydrogen atom or the oxygen atom,
  • - X 'and X ", identical or different from each other, each represent a chlorine atom or an optionally substituted alkyl or aryl or aralkyl or alkoxyl or aralkoxyl radical, at least one of X' and X" being necessarily an atom of chlorine, one of the X ′ and X ″ which can also be hydrogen,
  • - F ', R "and R"', identical or different from each other, each represents a chlorine atom or an optionally substituted alkyl or aryl or aralkyl or alkoxyl or aryloxyl radical, at least one of these three symbols representing the chlorine atom, at most two of R ' , R " or R "' which can, moreover, be hydrogen,

characterized in that the reaction is carried out in an essentially anhydrous medium, in the presence of a catalytic amount of at least one Lewis acid as catalyst.

Par «acide de Lewis», on entend des composés ayant un atome central déficitaire en électrons captant les électrons d'atomes tels que les halogènes. Les composés préférés sont des chlorures, bromures, iodures ou même fluorures d'éléments tels que le bore, l'aluminium, le gallium, l'étain, le phosphore, l'arsenic, l'antimoine, le bismuth, le titane, le zirconium, le molybdène, le manganèse, le fer, le cobalt, le nickel, le cuivre, le zinc et le cadmium.By "Lewis acid" is meant compounds having a central atom deficient in electrons capturing the electrons of atoms such as halogens. The preferred compounds are chlorides, bromides, iodides or even fluorides of elements such as boron, aluminum, gallium, tin, phosphorus, arsenic, antimony, bismuth, titanium, zirconium, molybdenum, manganese, iron, cobalt, nickel, copper, zinc and cadmium.

La demanderesse a notamment observé qu'on obtient des résultats intéressants avec, comme catalyseur, les chlorure et bromure d'aluminium, les chlorures stanneux et stannique, le chlorure ferrique, les chlorure, bromure et iodure de zinc, le chlorure cuivreux et le chlorure de nickel, des résultats particulièrement avantageux étant obtenus en utilisant le chlorure ou le bromure d'aluminium.The Applicant has observed in particular that interesting results are obtained with, as catalyst, aluminum chloride and bromide, stannous and stannic chlorides, ferric chloride, zinc chloride, bromide and iodide, cuprous chloride and chloride nickel, particularly advantageous results being obtained using aluminum chloride or bromide.

Par quantité catalytique, on entend, au sens de l'invention, une quantité telle que le rapport molaire de l'acide de Lewis au dérivé benzénique azoté et chloré de départ est compris entre 0,0001 et 1 et de préférence entre 0,01 et 0,5.By catalytic amount is meant, within the meaning of the invention, an amount such that the molar ratio of Lewis acid to the starting nitrogenous and chlorinated benzene derivative is between 0.0001 and 1 and preferably between 0.01 and 0.5.

Le procédé selon l'invention s'effectue en phase liquide (hormis bien sûr le catalyseur à base de métal noble). Cette phase liquide est organique et essentiellement anhydre. Elle est de préférence homogène, le milieu pouvant être constitué par le produit benzénique, azoté et chloré de départ, à l'état fondu (pour Y = H) ou par une solution de ce produit dans un solvant organique essentiellement anhydre et inerte dans les conditions de la réaction, solvant de préférence à point d'ébullition élevé, tel qu'un solvant aliphatique comme le cyclohexane, le dodécane ou un solvant aromatique tels que le chlorobenzène et les polychlorobenzènes. Ces derniers, en particulier, ne sont pas hydrochlorés dans les conditions de la réaction. La phase liquide peut également être hétérogène et constituée par un milieu liquide biphasé.The process according to the invention is carried out in the liquid phase (apart of course from the noble metal catalyst). This liquid phase is organic and essentially anhydrous. It is preferably homogeneous, the medium possibly consisting of the starting benzene, nitrogen and chlorine product, in the molten state (for Y = H) or by a solution of this product in an essentially anhydrous and inert organic solvent in the reaction conditions, preferably a high boiling solvent, such as an aliphatic solvent such as cyclohexane, dodecane or an aromatic solvent such as chlorobenzene and polychlorobenzenes. The latter, in particular, are not hydrochlorinated under the conditions of the reaction. The liquid phase can also be heterogeneous and consists of a two-phase liquid medium.

La pression, à laquelle s'effectue la réaction, peut être choisie dans une large gamme. Bien que cela ne soit pas avantageux, on peut opérer sous pression réduite, par exemple en milieu solvant à reflux. Cependant, de préférence, on travaille à une pression au moins égale à la pression atmosphérique. Le travail à pression atmosphérique permet d'apporter l'hydrogène sous forme de courant à un débit réglable.The pressure at which the reaction takes place can be selected from a wide range. Although this is not advantageous, it can be carried out under reduced pressure, for example in a solvent medium at reflux. However, preferably, one works at a pressure at least equal to atmospheric pressure. Working at atmospheric pressure makes it possible to supply hydrogen in the form of a current at an adjustable flow rate.

Lorsqu'on travaille sous pression, la pression est généralement supérieure à 3 bars (pression relative) et de préférence supérieure à 5 bars. Il n'y a pas de limite supérieure critique pour la pression mais pour des raisons d'ordre éconimi- que, il est avantageux d'opérer à des pressions inférieures à 100 bars, les pressions inférieures à 20 bars étant préférées.When working under pressure, the pressure is generally greater than 3 bars (relative pressure) and preferably greater than 5 bars. There is no critical upper limit for pressure, but for economic reasons, it is advantageous to operate at pressures below 100 bar, with pressures below 20 bar being preferred.

La température de réaction est généralement comprise entre 90 et 300°C, de préférence entre 110 et 200°C. Une température élevée peut, dans le cas où on utilise des acides de Lewis relativement volatils, impliquer l'existence d'une pression partielle relativement importante pour les composés de la phase vapeur autres que l'hydrogène (par phase vapeur on entend évidemment la phase vapeur surmontant le milieu liquide réactionnel).The reaction temperature is generally between 90 and 300 ° C, preferably between 110 and 200 ° C. A high temperature can, in the case where relatively volatile Lewis acids are used, imply the existence of a relatively high partial pressure for the compounds of the vapor phase other than hydrogen (by vapor phase we obviously mean the phase vapor overcoming the reaction liquid medium).

Les métaux nobles constituant la base des catalyseurs utilisés dans l'invention sont des métaux du groupe VIII de la classification périodique tels que le ruthénium, le rhodium, le palladium, l'osmium, l'iridium et le platine; le palladium est le métal préféré. Le métal peut être à l'état métallique ou à l'état de composé chimique; généralement on préfère que le métal soit mis en oeuvre à l'état métallique.The noble metals constituting the base of the catalysts used in the invention are metals from group VIII of the periodic classification such as ruthenium, rhodium, palladium, osmium, iridium and platinum; palladium is the preferred metal. The metal can be in the metallic state or in the state of a chemical compound; generally it is preferred that the metal is used in the metallic state.

Le catalyseur peut être supporté ou non supporté. Comme support du catalyseur, on peut utiliser tout support connu en soi pour supporter des catalyseurs, pourvu que ce support soit résistant au milieu et aux acides; comme support convenant plus particulièrement, on peut citer le charbon actif, l'alumine, la silice, le sulfate de baryum; le charbon actif est un support préféré. Le catalyseur ainsi que son support sont avantageusement sous forme finement divisée; des surfaces spécifiques supérieures à 100 m2/g conviennent généralement bien.The catalyst can be supported or unsupported. As support for the catalyst, any support known per se can be used to support catalysts, provided that this support is resistant to the medium and to acids; as a support which is more particularly suitable, mention may be made of activated carbon, alumina, silica, barium sulphate; activated carbon is a preferred support. The catalyst and its support are advantageously in finely divided form; specific surfaces greater than 100 m 2 / g are generally suitable.

La quantité de catalyseur mise en oeuvre est telle que la proportion pondérale de métal noble du catalyseur par rapport au composé de formule (I) à traiter est généralement comprise entre 0,01 et 10%, de préférence entre 0,1 et 5%.The amount of catalyst used is such that the proportion by weight of noble metal of the catalyst relative to the compound of formula (I) to be treated is generally between 0.01 and 10%, preferably between 0.1 and 5%.

Par ailleurs, le métal noble peut être associé à un autre métal codéposé avec lui sur le support. Ce second métal appartient aux groupes 1 b à 5a de la classification périodique. On peut citer en particulier le bismuth, le plomb, l'étain, le thallium, le mercure et l'argent. La demanderesse a notamment constaté que de bons résultats sont obtenus en utilisant l'argent.Furthermore, the noble metal can be associated with another metal co-deposited with it on the support. This second metal belongs to groups 1b to 5a of the periodic table. Mention may in particular be made of bismuth, lead, tin, thallium, mercury and silver. The Applicant has notably noted that good results are obtained by using silver.

Comme composés de formule (1) susceptibles d'être traités par le procédé de l'invention, on peut citer de préférence:

  • - le dichloro-2,3 nitrobenzène et la dichloro-2,3 aniline;
  • - le dichloro-2,5 nitrobenzène et la dichloro-2,5 aniline;
  • - tetrichtoro-3,4 nitrobenzène et la dichloro-3,4 aniline;
  • - le trichloro-2,3,4 nitrobenzène et la trichloro-2,3,4 aniline;
  • - le trichloro-2,3,5 nitrobenzène et la trichloro-2,3,5 aniline;
  • - le trichloro-2,3,6 nitrobenzène et la trichloro-2,3,6 aniline;
  • - le trichloro-2,4,5 nitrobenzène et la trichloro-2,4,5 aniline;
  • - le trichloro-3,4,5 nitrobenzène et la trichloro-3,4,5 aniline;
  • - le tétrachloro-2,3,4,6 nitrobenzène et la tétrachloro-2,3,4,6 aniline;
  • - le tétrachloro-2,3,4,5 nitrobenzène et la tétrachloro-2,3,4,5 aniline;
  • - le tétrachloro-2,3,5,6 nitrobenzène et la tétrachloro-2,3,5,6 aniline;
  • - le pentachloro-nitrobenzène et la pentachlo- roaniline; mais aussi:
  • - le trichloro-4,5,6 méthyl-2 nitrobenzène et la trichloro-4,5,6 méthyl-2 aniline;
  • - le dichloro-2,5 méthyl-4 nitrobenzène et la dichloro-2,5 méthyl-4aniline;
  • - le tétrachloro-2,3,5,6 méthyl-4 nitrobenzène et la tétrachloro-2,3,5,6 méthyl-4 aniline;
  • - le dichloro-2,5 diméthyl-3,4 nitrobenzène et la dichloro-2,5 diméthyl-3,4 aniline;
  • - le dichloro-2,5 éthyl-4 nitrobenzène et la dichloro-2,5 éthyl-4 aniline;
  • - le dichloro-2,5 propyl-4 nitrobenzène et la dichloro-2,5 propyl-4 aniline;
  • - le trichloro-3,4,6 benzyl-2 nitrobenzène et la trichloro-3,4,6 benzyl-2 aniline;
  • - le dinitro-2,2' hexachloro 3,5,6, 3', 5', 6' diphénylméthane et le diamino-2,2' hexachloro-3,5,6, 3',5',6' diphénylméthane;
  • - le nitro-2 trichloro-3,4,5 diphényle et l'ami- no-2 trichloro-3,4,5 diphényle;
  • - le dinitro-4,4' octachlorodiphényle et le dia- mino-4,4' octachloro diphényle;
  • - le dichloro-4,5 méthoxy-2 nitrobenzène et la dichloro-4,5 méthoxy-2 aniline;
  • - le dichloro-3,4 méthoxy-2 nitrobenzène et la dichloro-3,4 méthoxy-2 aniline;
  • - le dichloro-3,6 méthoxy-2 nitrobenzène et la dichloro-3,6 méthoxy-2 aniline;
  • - le dichloro-5,6 méthoxy-2 nitrobenzène et la dichloro-5,6 méthoxy-2 aniline;
  • - le trichloro-3,4,6 méthoxy-2 nitrobenzène et la trichloro-3,4,6 méthoxy-2 aniline;
  • - le trichloro-3,4,5 méthoxy-2 nitrobenzène et la trichloro-3,4,5 méthoxy-2 aniline;
  • - le tétrachloro-3,4,5,6 méthoxy-2 nitrobenzène et la tétrachloro-3,4,5,6 méthoxy-2 aniline;
  • - le dichloro-4,5 méthoxy-3 nitrobenzène et la dichloro-4,5 méthoxy-3 aniline;
  • - le dichloro-5,6 méthoxy-3 nitrobenzène et la dichloro-5,6 méthoxy-3 aniline;
  • - le dichloro-2,5 méthoxy-3 nitrobenzène et la dichloro-2,5 méthoxy-3 aniline;
  • - le trichloro-4,5,6 méthoxy-3 nitrobenzène et la trichloro-4,5,6 méthoxy-3 aniline;
  • - le tétrachloro-2,4,5,6 méthoxy-3 nitrobenzène et la tétrachloro-2,4,5,6 méthoxy-3 aniline;
  • - le dichloro-2,3 méthoxy-4 nitrobenzène et la dichloro-2,3 méthoxy-4 aniline;
  • - le dichloro-2,5 méthoxy-4 nitrobenzène et la dichloro-2,5 méthoxy-4 aniline;
  • - le trichloro-2,3,6 méthoxy-4 nitrobenzène et la trichloro-2,3,6 méthoxy-4 aniline;
  • - le trichloro-2,3,5 méthoxy-4 nitrobenzène et la trichloro-2,3,5 méthoxy-4 aniline;
  • - le tétrachloro-2,3,5,6 méthoxy-4 nitrobenzène et la tétrachloro-2,3,5,6 méthoxy-4 aniline;
  • - le dichloro-4,5 phénoxy-2 nitrobenzène et la dichloro-4,5 phénoxy-2 aniline;
  • - le tétrachloro-3,4,5,6 phénoxy-2 nitrobenzène et la tétrachloro-3,4,5,6 phénoxy-2 aniline;
  • - le tétrachloro-2,4,5,6 phénoxy-3 nitrobenzène et la tétrachloro-2,4,5,6 phénoxy-3 aniline;
  • - le dichloro-2,5 phénoxy-4 nitrobenzène et la dichloro-2,5 phénoxy-4 aniline;
  • - le tétrachloro-2,3,5,6 phénoxy-4 nitrobenzène et la tétrachloro-2,3,5,6 phénoxy-4 aniline.
As compounds of formula (1) capable of being treated by the process of the invention, mention may preferably be made of:
  • - 2,3-dichloro-nitrobenzene and 2,3-dichloro-aniline;
  • - 2,5-dichloro-nitrobenzene and 2,5-dichloro aniline;
  • - 3,4-tetrichtoro-nitrobenzene and 3,4-dichloro aniline;
  • - 2,3,4,4-trichloro nitrobenzene and 2,3,4-trichloro aniline;
  • - 2,3,5-trichloro-nitrobenzene and 2,3,5-trichloro aniline;
  • - 2,3,6-trichloro nitrobenzene and 2,3,6-trichloro aniline;
  • - 2,4,5,5-trichloro nitrobenzene and 2,4,5-trichloro aniline;
  • - 3,4,5,5-nitrobenzene trichloro and 3,4,5-aniline trichloro;
  • - 2,3,4,6 tetrachloro nitrobenzene and 2,3,4,6 tetrachloro aniline;
  • - 2,3,4,5 tetrachloro nitrobenzene and 2,3,4,5 tetrachloro aniline;
  • - 2,3,5,6 tetrachloro nitrobenzene and 2,3,5,6 tetrachloro aniline;
  • - pentachloro-nitrobenzene and pentachloroaniline; but also:
  • - 4,5,6,6-trichloro-2-methyl nitrobenzene and 4,5,6-trichloro-2-methyl aniline;
  • - 2,5-dichloro-4-methyl nitrobenzene and 2,5-dichloro-methyl-4aniline;
  • - 2,3,5,6-tetrachloro-4-methyl nitrobenzene and 2,3,5,6-tetrachloro-4-methyl aniline;
  • - 2,5-dichloro-3,4-dimethyl-nitrobenzene and 2,5-dichloro-3,4-dimethyl-aniline;
  • - 2,5-dichloro-4-ethyl nitrobenzene and 2,5-dichloro-4-ethyl aniline;
  • - 2,5-dichloro-propyl-4 nitrobenzene and 2,5-dichloro-propyl-4 aniline;
  • - 3,4,4,6-benzyl-2-nitrobenzene trichloro-3,4,6-benzyl-2-aniline trichloro;
  • - dinitro-2,2 'hexachloro 3,5,6, 3', 5 ', 6' diphenylmethane and diamino-2,2 ' hexachloro-3,5,6, 3', 5 ', 6'diphenylmethane;
  • - 2-nitro-3,4,5,5-diphenyl and 2-amino-3,4,5-diphenyl trichloro;
  • - 4,4 'dinitro-octachlorodiphenyl and 4,4' dinitro-octachloro diphenyl;
  • - 4,5-dichloro-2-methoxy-nitrobenzene and 4,5-dichloro-2-methoxy-aniline;
  • - 3,4-dichloro-2-methoxy-nitrobenzene and 3,4-dichloro-2-methoxyaniline;
  • - 3,6-dichloro-2-methoxy-nitrobenzene and 3,6-dichloro-2-methoxy-aniline;
  • - 5,6-dichloro-2-methoxy-nitrobenzene and 5,6-dichloro-2-methoxyaniline;
  • - 3,4,4,6-methoxy-2-nitrobenzene trichloro-3,4,6-methoxy-2 aniline trichloro;
  • - 3,4,5,5-trichloro-2-methoxy nitrobenzene and 3,4,5-trichloro-2-methoxyaniline;
  • - 3,4,5,6-tetrachloro-2-methoxy-nitrobenzene and 3,4,5,6-tetrachloro-2-methoxy-aniline;
  • - 4,5-dichloro-3-methoxy nitrobenzene and 4,5-dichloro-3-methoxy aniline;
  • - 5,6-dichloro-3-methoxy-nitrobenzene and 5,6-dichloro-3-methoxyaniline;
  • - 2,5-dichloro-3-methoxy-nitrobenzene and 2,5-dichloro-3-methoxy-aniline;
  • - 4,5,6,6-methoxy-3,5-nitrobenzene trichloro-4,5,6-3-methoxy-aniline trichloro;
  • - 2,4,5,6-tetrachloro-3-methoxy-nitrobenzene and 2,4,5,6-tetrachloro-3-methoxy-aniline;
  • - 2,3-dichloro-4-methoxy-nitrobenzene and 2,3-dichloro-4-methoxy-aniline;
  • - 2,5-dichloro-4-methoxy-nitrobenzene and 2,5-dichloro-4-methoxy-aniline;
  • - 2,3,6,6-trichloro-4-methoxy nitrobenzene and 2,3,6-trichloro-4-methoxyaniline;
  • - 2,3,5-trichloro-4,5 methoxy-nitrobenzene and 2,3,5-trichloro-4-methoxy aniline;
  • - 2,3,5,6-tetrachloro-4,5-methoxy nitrobenzene and 2,3,5,6-tetrachloro-4-methoxyaniline;
  • - 4,5-dichloro-2-phenoxy-nitrobenzene and 4,5-dichloro-2-phenoxy-aniline;
  • - 3,4,5,6 tetrachloro-2-phenoxy nitrobenzene and 3,4,5,6-tetrachloro-2-phenoxy aniline;
  • - 2,4,5,6-tetrachloro-3-phenoxy-nitrobenzene and 2,4,5,6-tetrachloro-3-phenoxyaniline;
  • - 2,5-dichloro-4-phenoxy-nitrobenzene and 2,5-dichloro-4-phenoxyaniline;
  • - 2,3,5,6-tetrachloro-4-phenoxy-nitrobenzene and 2,3,5,6-tetrachloro-phenoxy-4 aniline.

Parmi les anilines substituées en position méta par l'atome de chlore et susceptibles d'être préparées par le procédé selon l'invention, on peut citer de préférence: la métachloraniline; la dichloro-3,5 aniline mais aussi la chloro-5 méthyl-2 aniline; la chloro-5 méthyl-3 aniline; la chloro-3 méthÿl-4 aniline; la dichloro-3,5 méthyl-4 aniline; la chloro-5 diméthyl-3,4 aniline; la chloro-3 éthyl-4 aniline; la chloro-3 benzyl-2 aniline; le dia- mino-4,4' tétrachtoro-2,6,2',6' diphényle; la chloro-3 méthoxy-2 aniline; la chloro-5 méthoxy-2 aniline; la dichloro-3,5 méthoxy-2 aniline; la chloro-3 méthoxy-4 aniline; la chloro-5 méthoxy-3 aniline; la dichloro-3,5 méthoxy-4 aniline; la chloro-3 phénoxy-2 aniline; la chloro-5 phénoxy-2 aniline; la dichloro-3,5 phénoxy-2 aniline; la dichloro-3,5 phénoxy-4 aniline.Among the anilines substituted in meta position by the chlorine atom and capable of being prepared by the process according to the invention, there may be mentioned preferably: metachloraniline; 3,5-dichloro aniline but also 5-chloro-2-methyl aniline; 5-chloro-3-methyl aniline; chloro-3 methÿl-4 aniline; 3,5-dichloro-4-methyl aniline; 5-chloro-3,4-dimethyl aniline; 3-chloro-4-ethyl aniline; 3-chloro-2-benzyl aniline; 4,4-diamino-2,6,2 'tetrachtoro, 6' diphenyl; 3-chloro-2-methoxy aniline; 5-chloro-2-methoxy aniline; 3,5-dichloro-2-methoxy aniline; 3-chloro-4-methoxy aniline; 5-chloro-3-methoxy aniline; 3,5-dichloro-4-methoxy aniline; 3-chloro-2-phenoxy aniline; 5-chloro-2-phenoxy aniline; 3,5-dichloro-2-phenoxy aniline; 3,5-dichloro-4-phenoxy aniline.

Le procédé selon l'invention peut être effectué en continu ou en discontinu. En fin de réaction, le catalyseur peut être séparé, le cas échéant, par filtration ou par des moyens équivalents tels que l'essorage; l'aniline métachlorée préparée peut être séparée par tout moyen connu en soi, par exemple par extraction à l'aide d'un solvant et/ou par distillation.The process according to the invention can be carried out continuously or batchwise. At the end of the reaction, the catalyst can be separated, if necessary, by filtration or by equivalent means such as spinning; the metachlorinated aniline prepared can be separated by any means known per se, for example by extraction using a solvent and / or by distillation.

Le procédé selon l'invention est très avantageux car il permet d'obtenir des anilines métachlorées dans d'excellentes conditions de sélectivité, à des températures et sous des pressions modérées, et ce sans souci de corrosion importante et d'usure prématurée du matériel. Les exemples suivants, donnés à titre non limitatif illustrent la mise en oeuvre du procédé selon l'invention et les résultats obtenus.The process according to the invention is very advantageous since it makes it possible to obtain metachlorinated anilines under excellent conditions of selectivity, at temperatures and under moderate pressures, without worrying about significant corrosion and premature wear of the material. The following examples, given without limitation, illustrate the implementation of the method according to the invention and the results obtained.

Exemple 1Example 1

Dans un autoclave de 70 cm3 revêtu intérieurement de tantale on charge:

  • -1,16 g de tétrachloro-2,3,4,5 aniline,
  • - 0,4 g d'un catalyseur constitué de palladium déposé sur du charbon actif (surface spécifique du noir de carbone: 1300 m2/g; teneur pondérale en palladium 10%),
  • -17 cm3 de cyclohexane anhydre,
  • - 3 cm3 d'une solution à 5% (poids/volume) de bromure d'aluminium (AI Br3) dans le cyclohexane anhydre.
In an autoclave of 70 cm 3 coated internally with tantalum, we load:
  • -1.16 g of 2,3,4,5 aniline tetrachloro,
  • - 0.4 g of a catalyst consisting of palladium deposited on activated carbon (specific surface area of carbon black: 1300 m 2 / g; weight content of palladium 10%),
  • -17 cm 3 of anhydrous cyclohexane,
  • - 3 cm 3 of a 5% solution (weight / volume) of aluminum bromide (AI Br 3 ) in anhydrous cyclohexane.

L'autoclave est fermé, purgé d'abord à l'argon, puis à l'hydrogène. On introduit ensuite de l'hydrogène sous une pression de 10 bars, on isole l'autoclave et chauffe à 160°C en laissant croître la pression autogène jusqu'à une pression totale (relative) de 21 bars. On laisse réagir dans ces conditions pendant 4H30mn.The autoclave is closed, purged first with argon, then with hydrogen. Then hydrogen is introduced at a pressure of 10 bars, the autoclave is isolated and heated to 160 ° C. while allowing the autogenous pressure to increase to a total (relative) pressure of 21 bars. It is left to react under these conditions for 4 h 30 min.

On refroidit. On filtre le contenu de l'autoclave pour séparer le catalyseur solide de la solution hexanique. Cette dernière est ensuite lavée par une solution aqueuse de soude (NaOH) de façon à neutraliser totalement l'acide chlorhydrique issu de la réaction.We cool. The contents of the autoclave are filtered to separate the solid catalyst from the hexane solution. The latter is then washed with an aqueous sodium hydroxide solution (NaOH) so as to completely neutralize the hydrochloric acid resulting from the reaction.

Après distillation du cyclohexane, on obtient la 3,5-dichloraniline avec un rendement de 99,5 %.After distillation of the cyclohexane, 3,5-dichloraniline is obtained with a yield of 99.5%.

Exemple 2Example 2

On opère comme à l'exemple 1 avec les charges suivantes:

  • -1,16 g de 2,3,4,5 tétrachloraniline,
  • - 0,4 g d'un catalyseur constitué de palladium déposé à raison de 5% en poids sur le même charbon actif qu'à l'exemple 1,
  • - 0,095 g de chlorure stanneux anhydre (soit 0,082 partie par partie de TTCA),
  • - 20 cm3 de cyclohexane.
The procedure is as in Example 1 with the following charges:
  • -1.16 g of 2,3,4,5 tetrachloraniline,
  • - 0.4 g of a catalyst consisting of palladium deposited at a rate of 5% by weight on the same active carbon as in Example 1,
  • - 0.095 g of anhydrous stannous chloride (i.e. 0.082 parts per part of TTCA),
  • - 20 cm 3 of cyclohexane.

On obtient la 3,5-dichloraniline avec un rendement de 96,5%.3,5-Dichloraniline is obtained with a yield of 96.5%.

Exemple 3Example 3

On opère comme à l'exemple 1 avec les charges suivantes:

  • -1 g de 2,3,4,5-tétrachloraniline,
  • - 0,3 g du catalyseur utilisé à l'exemple précédent,
  • - 0,64 g de chlorure stanneux anhydre,
The procedure is as in Example 1 with the following charges:
  • -1 g of 2,3,4,5-tetrachloraniline,
  • - 0.3 g of the catalyst used in the previous example,
  • - 0.64 g of anhydrous stannous chloride,

Ce dernier est dissout dans l'aniline fondue, à la température de réaction (160°C). La réaction dure 3H20mn.The latter is dissolved in the molten aniline at the reaction temperature (160 ° C). The reaction lasts 3H20mn.

Dans ces conditions, on obtient la 3,5-dichloraniline avec un rendement de 100%.Under these conditions, 3,5-dichloraniline is obtained with a yield of 100%.

Exemple 4Example 4

On opère come à l'exemple 2 en remplaçant le chlorure stanneux par 0,32 g d'iodure de zinc. La réaction dure 10 heures.The procedure is as in Example 2, replacing the stannous chloride with 0.32 g of zinc iodide. The reaction lasts 10 hours.

Dans ces conditions, on obtient la 3,5-dichloraniline avec un rendement de 98,2%.Under these conditions, 3,5-dichloraniline is obtained with a yield of 98.2%.

Exemples 5 à 13Examples 5 to 13

Dans un autoclave de 70 cm3 revêtu intérieurement de tantale, on charge:

  • - 1 g de 2,3,4,5-tétrachloraniline (TTCA),
  • - 0,3 g d'un catalyseur à 3% de palladium et 2% d'argent codéposés sur du charbon actif de surface spécifique d'environ 1300 m2/g,
  • - une quantité variable d'un acide de Lewis comme catalyseur.
In a 70 cm 3 autoclave coated internally with tantalum, we load:
  • - 1 g of 2,3,4,5-tetrachloraniline (TTCA),
  • - 0.3 g of a catalyst containing 3% palladium and 2% silver co-deposited on activated carbon with a specific surface of approximately 1300 m 2 / g,
  • - a variable amount of a Lewis acid as catalyst.

La réaction s'effectue à 160°C sous 21 bars. Le traitement du milieu réactionnel après réaction est effectué comme à l'exemple 1.The reaction is carried out at 160 ° C under 21 bars. The treatment of the reaction medium after reaction is carried out as in Example 1.

Le tableau ci-apres indique la durée de la réaction et le rendement en 3,5-dichloraniline pour chaque acide de Lewis et pour un rapport molaire acide de Lewis/tétrachloraniline (A.L/TTCA) donné.

Figure imgb0002
The table below indicates the reaction time and the yield of 3,5-dichloraniline for each Lewis acid and for a given Lewis acid / tetrachloraniline molar ratio (LA / TTCA).
Figure imgb0002

Exemple 14Example 14

On opère comme à l'exemple 1 en remplaçant la 2,3,4,5-tétrachloraniline par une quantité égale de 2,3,5,6-tétrachloraniline. La réaction dure 13 heures.The procedure is as in Example 1, replacing 2,3,4,5-tetrachloraniline with an equal amount of 2,3,5,6-tetrachloraniline. The reaction lasts 13 hours.

Dans ces conditions, on obtient la 3,5-dichloro- aniline avec un rendement de 99,6%.Under these conditions, 3,5-dichloroaniline is obtained with a yield of 99.6%.

Exemple 15Example 15

On opère comme à l'exemple 1 en remplaçant la 2,3,4,5-tétrachloraniline par la 3,4,5-trichlorani- line (0,985 g), l'acide de Lewis étant ajouté sous forme de 1 cm3 d'une solution cyclohexanique à 10% p/v et en utilisant 0,05 g du même catalyseur au palladium.The procedure is as in Example 1, replacing 2,3,4,5-tetrachloraniline with 3,4,5-trichloraninine (0.985 g), Lewis acid being added in the form of 1 cm 3 d '' a 10% w / v cyclohexane solution and using 0.05 g of the same palladium catalyst.

La réaction est conduite pendant 120 mn.The reaction is carried out for 120 min.

Dans ces conditions, on obtient la 3,5-dichloraniline avec un rendement de 86%.Under these conditions, 3,5-dichloraniline is obtained with a yield of 86%.

Exemple 16Example 16

Dans un réacteur de 250 ml, équipé d'un agitateur central tournant à 1000 tours/mn, d'un réfrigérant, d'un thermomètre et d'une arrivée de gaz, on charge:

  • -10 g (0,05 mole) de trichloro-3,4,5-aniline,
  • - 0,4 g (1,25 x 10-3 mole) de iodure de zinc (Znlz),
  • - 0,5 g d'un catalyseur au palladium à 5% sur charbon actif,
  • - 56,5 g (0,35 mole) de dichloro-3,5 aniline.
In a 250 ml reactor, equipped with a central agitator rotating at 1000 revolutions / min, a refrigerant, a thermometer and a gas inlet, we charge:
  • -10 g (0.05 mole) of 3,4,5-aniline trichloro,
  • - 0.4 g (1.25 x 10- 3 mole) of zinc iodide (Znl z ),
  • - 0.5 g of a 5% palladium catalyst on activated carbon,
  • - 56.5 g (0.35 mole) of 3,5-dichloro aniline.

On introduit ensuite l'hydrogène comme à l'exemple 1, si ce n'est que la pression totale est de 20 bars et que le chauffage est effectué à 180°C pendant deux heures.Then hydrogen is introduced as in Example 1, except that the total pressure is 20 bars and the heating is carried out at 180 ° C for two hours.

Dans ces conditions, toute la trichloro-3,4,5-aniline est tranformée et on obtient la 3,5-aniline avec un rendement de 100%.Under these conditions, all of the 3,4,5-aniline trichloro is transformed and 3,5-aniline is obtained with a yield of 100%.

Exemple 17Example 17

Dans un ballon de capacité 100 ml, muni d'un agitateur central tournant à 1000 tours/mn, d'un réfrigérant, d'un thermomètre et d'une arrivée de gaz, on charge:

  • - 2 g (environ 0,01 mole) de trichloro-3,4,5-aniline,
  • - 0,6 g (2,25 x 10-3 mole) de bromure d'aluminium (AIBr3),
  • - 0,8 g d'un catalyseur au palladium à 5% sur charbon actif,
  • - 20 ml de dodécane.
In a 100 ml capacity flask, fitted with a central agitator rotating at 1000 revolutions / min, a refrigerant, a thermometer and a gas supply, we charge:
  • - 2 g (approximately 0.01 mole) of 3,4,4,5-aniline trichloro,
  • - 0.6 g (2.25 x 10- 3 mole) of aluminum bromide (AIBr 3 ),
  • - 0.8 g of a 5% palladium catalyst on activated carbon,
  • - 20 ml of dodecane.

On maintient une température de 160°C et à la pression atmosphérique on envoie un courant d'hydrogène de 6 litres/h pendant 30 mn.A temperature of 160 ° C. is maintained and at atmospheric pressure a stream of hydrogen of 6 liters / h is sent for 30 minutes.

La masse réactionnelle est ensuite traitée par de l'eau puis de l'éther. On sépare le catalyseur puis l'eau. On élimine les solvants par distillation.The reaction mass is then treated with water and then with ether. The catalyst is separated then the water. The solvents are removed by distillation.

Dans ces conditions, on obtient la dichloro-3,5-aniline avec un rendement de 99,5%. Le taux de transformation de la trichloro-3,4,5 aniline est de 100%.Under these conditions, 3,5-dichloro-aniline is obtained with a yield of 99.5%. The transformation rate of 3,4,5,5-aniline trichloro is 100%.

Exemple 18Example 18

On opère comme à l'exemple précédent dans un réacteur de 250 ml, équipé de la même manière, avec les charges suivantes:

  • -19,7 g (0,1 mole) de trichloro-3,4,5-aniline,
  • - 3,0 g (1,12 x 10-2 mole) de bromure d'aluminium (AIBra),
  • - 0,5 g du catalyseur au palladium à 5% sur charbon actif,
  • - 60 ml de trichtoro-1,2,4-benzène.
The procedure is as in the previous example in a 250 ml reactor, equipped in the same way, with the following charges:
  • -19.7 g (0.1 mole) of 3,4,5-aniline trichloro,
  • - 3.0 g (1.12 x 10- 2 mole) of aluminum bromide (AIBra),
  • - 0.5 g of the 5% palladium catalyst on activated carbon,
  • - 60 ml of 1,2,4-trichtoro-benzene.

Le milieu réactionnel étant mis sous agitation, on maintient une température de 160°C et un courant d'hydrogène de 27 I/h pendant 4 heures.The reaction medium being stirred, a temperature of 160 ° C. and a hydrogen stream of 27 l / h are maintained for 4 hours.

En opérant comme à l'exemple précédent, on obtient la dichloro-3,5 aniline avec un rendement de 100%.By operating as in the previous example, 3,5-dichloro aniline is obtained with a yield of 100%.

Claims (19)

1. A process for the preparation of anilines substituted in the meta-position by chlorine, by the catalytic hydrogenation, in the liquid phase, under the action of heat and at atmospheric pressure or under pressure, in the presence of noble metals from group VIII of the periodic classification, of nitrogen-containing and chlorine-containing benzene derivatives of the formula:
Figure imgb0005
in which: Y represents the hydrogen atom or the oxygen atom, X' and X", which are identical to or different from one another, each represent a chlorine atom, or an optionally substituted alkyl, aryl, aralkyl, alkoxy or aralkoxy radical, at least one of the symbols X' and X" necessarily being a chlorine atom and it being furthermore possible for one of the symbols X' and X" to be hydrogen, and R', R" and R"', which are identical to or different from one another, each represent a chlorine atom or an optionally substituted alkyl, aryl, aralkyl, alkoxy or aryloxy radical, at least one of these three symbols representing the chlorine atom and it being furthermore possible for at most two of the symbols R', R" or R"' to be hydrogen, in which process the reaction is carried out in an essentially anhydrous medium, in the presence of a catalytic amount of at least one Lewis acid as a catalyst.
2. A process according to claim 1, wherein the Lewis acid is a halide of an element chosen from the group comprising boron, aluminium, gallium, tin, phosphorus, arsenic, antimony, bismuth, titanium, zirconium, molybdenum, manganese, iron, cobalt, nickel, copper, zinc and cadmium.
3. A process according to claim 2, wherein the reaction is carried out in the presence of a catalytic amount of a compound chosen from the group comprising aluminium chloride and bromide, stannous and stannic chlorides, ferric chloride, zinc chloride and iodide, cuprous chloride and nickel chloride.
4. A process according to one of claims 1 to 3, wherein the molar ratio of the Lewis acid to the starting nitrogen-containing and chlorine-containing benzene derivative is between 0.0001 and 1.
5. A process according to claim 4, wherein the molar ratio of the Lewis acid to the starting nitrogen-containing and chlorine-containing benzene derivative is between 0.01 and 0.5.
6. A process according to one of claims 1 to 5, wherein the reaction is carried out in the molten starting material.
7. A process according to one of claims 1 to 5, wherein the reaction is carried out in solution in an organic solvent.
8. A process according to one of claims 1 to 7, wherein R', R", R"', X' and X", which are identical to or different from one another, represent the hydrogen atom or the chlorine atom.
9. A process for the preparation of optionally substituted meta-dichloroanilines, according to one of claims 1 to 8, wherein X' and X" represent the chlorine atom.
10. A process for the preparation of optionally substituted meta-monochloroanilines, according to one of claims 1 to 8, wherein only one of the two radicals X' andX" is the chlorine atom.
11. A process for the preparation of 3,5-dichloroaniline, according to claims 1 to 9, wherein: Y is the hydrogen or oxygen atom, X' and X" are the chlorine atom and R', R" and R"' are the hydrogen atom or the chlorane atom, at least one of them being the chlorine atom.
12. A process according to one of claims 1 to 11, wherein the reaction medium only contains a liquid phase, except for the catalyst based on a noble metal.
13. A process according to one of claims 1 to 12, wherein the reaction is carried out at a pressure below 3 bars.
14. A process according to claim 13, wherein the reaction is carried out at atmospheric pressure.
15. A process according to one of claims 1 to 12, wherein the total pressure is between 3 and 100 bars.
16. A process according to claim 15, wherein the total pressure is between 5 and 20 bars.
17. A process according to one of claims 1 to 16, wherein the temperature is between 90 and 300°C, preferably between 110 and 200°C.
18. A process according to one of claims 1 to 17, wherein the catalyst is palladium.
19. A process according to one of claims 1 to 18, wherein the proportion by weight of noble metal, relative to the compound of the formula (I), is between 0.01 and 10%, preferably between 0.1 and 5%.
EP81420115A 1980-08-01 1981-07-30 Process for the preparation of meta-chlorinated anilines Expired EP0045709B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420115T ATE9686T1 (en) 1980-08-01 1981-07-30 PROCESS FOR THE PRODUCTION OF META-CHLORINATED ANILINES.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8017324A FR2487823A1 (en) 1980-08-01 1980-08-01 Meta-chloro-aniline(s) prepn. by catalytic dehydrochloridation - with hydrogen, noble metal catalyst and Lewis acid in anhydrous medium, yields plant protection agent intermediates
FR8017324 1980-08-01
FR8020979 1980-09-26
FR8020979A FR2491059A2 (en) 1980-09-26 1980-09-26 Meta-chloro-aniline(s) prepn. by catalytic dehydrochloridation - with hydrogen, noble metal catalyst and Lewis acid in anhydrous medium, yields plant protection agent intermediates

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EP0045709A1 EP0045709A1 (en) 1982-02-10
EP0045709B1 true EP0045709B1 (en) 1984-10-03

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EP81420115A Expired EP0045709B1 (en) 1980-08-01 1981-07-30 Process for the preparation of meta-chlorinated anilines

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US (1) US4418213A (en)
EP (1) EP0045709B1 (en)
KR (1) KR850000148B1 (en)
BR (1) BR8104979A (en)
CA (1) CA1211470A (en)
DD (1) DD201673A5 (en)
DE (1) DE3166482D1 (en)
DK (1) DK342981A (en)
ES (1) ES8306092A1 (en)
HU (1) HU187348B (en)
IE (1) IE51457B1 (en)
IL (1) IL63297A (en)
SU (1) SU1176830A3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2532305A1 (en) * 1982-08-24 1984-03-02 Rhone Poulenc Agrochimie PROCESS FOR THE PREPARATION OF METABLORINE ANILINES
USRE34745E (en) * 1986-10-30 1994-09-27 The Dow Chemical Company High purity process for the preparation of 4,6-diamino-1,3-benzenediol
US5001279A (en) * 1989-11-17 1991-03-19 The Dow Chemical Company Aqueous synthesis of 2-halo-4,6-dinitroresorcinol and 4,6-diaminoresorcinol
US5051030A (en) * 1990-06-05 1991-09-24 Roy F. Weston, Inc. Chemical detoxification process for treatment of soils contaminated with halogenated organic compounds
JPH0565250A (en) * 1991-01-28 1993-03-19 Ishihara Sangyo Kaisha Ltd Production of 3,5-difluoroaniline
US5089653A (en) * 1991-04-04 1992-02-18 Dow Elanco Process for the selective reduction of the 4-halogen in 2,4-dihaloanilines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU517576A1 (en) * 1971-05-24 1976-06-15 Предприятие П/Я А-7797 Method for producing mixed haloaromatic hydrocarbons
DE2503187C3 (en) * 1975-01-27 1979-05-31 Bayer Ag, 5090 Leverkusen Process for the preparation of chlorine-meta-substituted anilines
FR2449076A2 (en) * 1979-02-15 1980-09-12 Rhone Poulenc Agrochimie PROCESS FOR THE PREPARATION OF METACHLORINATED ANILINES
FR2449075A1 (en) * 1979-02-15 1980-09-12 Rhone Poulenc Agrochimie PROCESS FOR THE PREPARATION OF METACHLORINATED ANILINES

Also Published As

Publication number Publication date
DD201673A5 (en) 1983-08-03
SU1176830A3 (en) 1985-08-30
DK342981A (en) 1982-02-02
CA1211470A (en) 1986-09-16
IE811738L (en) 1982-02-01
KR830006170A (en) 1983-09-17
IL63297A0 (en) 1981-10-30
KR850000148B1 (en) 1985-02-28
ES504473A0 (en) 1982-12-01
DE3166482D1 (en) 1984-11-08
HU187348B (en) 1985-12-28
US4418213A (en) 1983-11-29
ES8306092A1 (en) 1982-12-01
EP0045709A1 (en) 1982-02-10
IE51457B1 (en) 1986-12-24
BR8104979A (en) 1982-04-20
IL63297A (en) 1984-05-31

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